Stir Plate Power Control Question

[briewer2]

Would this work as the speed control for my stir plate build?

I am planning on installing a 120mm computer fan inside a 8x6X3 project box. I am wondering if this will work as the speed control. Thanks!

http://www.radioshack.com/product/index.jsp?productId=2062355

 

[barryhannah]

Depends on the wattage of your fan, which will also depend on the voltage of your power supply. Got those two bits?

 

[briewer2]

My plan is to use this fan

http://www.amazon.com/Cooler-Master-SickleFlow-120-Radiators/dp/B0026ZPFCK/ref=sr_1_1?s=electronics&ie=UTF8&qid=1403215732&sr=1-1&keywords=computer+fan

With a standard 12v power supply like this one

http://www.amazon.com/dp/B006NTNGN0/?tag=skimlinks_replacement-20

 

[raouliii]

Depends on the circuit you plan to use that 50000 ohm pot in. Given that the fan is 12v/.35a; it has about 35 ohms of resistance. A pot in series with the fan would need to have around 30-40 ohms to function as a decent voltage divider.

 

[j1n]

id get a smaller fan. im using a 120mm and full speed its just fast enough. i think the magnets on the fan slow it down some. the smaller fans have to spin faster to achieve the same cfm. if i added a speed dial on mine it would be pointless since i got to keep it going full speed. I pulled this fan out of an old pc i build a while ago and the fan has 3 settings already on the wire (low med high).